Upripper



P. H. COOK UPRIPPER. APPLICATION man MAY4.192|.

v'come well, whereby the casing may bev lifted out yent specification.

vshown inl part in section.

ilatenteol Nov. 14,1922.

unirse stares N airain rarer-rr carica.

PHILLIP n'. COOK, or MARICOPA, CALIFORNIA, A'ssIeNoR or ONE-THIRD TOWALTRR yv. HARRINGTony Airports-,THIRD :ro ARTHUR er. POTTER, ROTH or OAKLAND,

CALIFORNIA.

. UPRIPPER.

Application filed May 4, 1921. SelialfNo. 466,793.`v

T0 all inkom t may] concern:

Be it known that'I, PHILLIP IPI. Gooi-I, a

citizen of the United: State`s,residing at Mar-` icopa1 in the county of Kern and State of California, have invented new and ,useful Improvements. in 'Uprippers, -ofv which the Y following is a specification.

.The present inventionrelates in general to improvements in well tools and more particularly to animproved tool for vertically ripping or cutting` well casingwhich h'asbefrozen or stuck in the bore ofthe or removed more'easily and expeditiously.

They primaryI object of the invention; is to provide a tool which, after being lowered into-the casing and when lifted -or pulled upwardly, will longitudinally rip or out thru the part of the casing which has frozen inthe well'whereby said ripped portion will collapse and the casing. may, therefore, be easilyy removed by being lifted lout of the well, the cutting or ripping means being suoli that upon release of the .frozen or stuck portion, saidcutting 'will cease and said cutting means engaging 1n theupper end of the slit or cut, provides lfor lifting the l vof the body, or in other words, two sides scrib'edwhich tool may be operated with the ordinary well rigging.

The invention posseses other advantages and features some of'which, with the foregoing will be set forth at length in the following descript-ion where I shall outline in full that form of the'inventionwhich I have selected for illustration inthe drawings accompanying and forming a part of the pres- In? said drawings I have shown one form of the construction of my invention, but it is to beunderstood that I do not limit myself to such form since the invention as expressed in the claims may" be embodied in a plurality 'of forms.'

` Referring to the drawings:

Figure l is a vertical sectional view of a section of well casing'showing the tool in Aside elevation andfas'it would appear while broken andV being lowered, the tool being Figure 2 is a vertical sectional view of ya section of well' casing showing the tool in side elevation and as it would appear while being lifted, the lower portion of the casing being ripped. y A y Figure 3 is a cross sectional view taken on line 3 3 of Fig. 2. v

Figure i4 is a fragmentary side elevation ofa modified formpof tool, showing` two yknives arranged to rip opposite sides of the casing.; y l Referrlngto the accompanying drawing in which there is shown one embodiment of the invention, 4L designates the body of the tool havingat its upper. end a-screw threaded stem 5 adapted'to screw into a drill jar, not

shown, of the ordinarywell rigging, also not shown.- 'I-he bodyis provided with acentral `llongitudinalslot or opening 6 andis tapered e to a point 7 at its lowervend. .The slot or vopening provides two opposite armsS, each of which is substantially rectilinear in cross section. The outer side faces of these arms -arefadaptedto lie in close proximity to, ifl

thereof, with the inner wall' of the casing. By having the lowerfendof the body pointedy the tool will readily pass any obstructions y encountered in the casing whilev being low-` ered, since inthe practice with stem and jar attached, the tool will usually weigh'over BOOOlbs. 'f While thebody-as sho-wn inthe drawing is'slottedl and of a general rectilinear outline in cross section, it may beotherwise'shaped if desired,`provided it hassuflicient body and weight to provide for accomplishing the ends to be later herein described,

and provided-it'may be readily attached to 'ordinary rigging and can be easily lowered.

VBy having the body ofthe shape shown and described, the tool offersfless resistance to sand or other obstructions while being lowered. H' y "f I mount upon the body of the tool, cutting or ripping rneans which',while thextool is lowered, will be, heldin inoperative position and whenlthetooliis lifted or raised will *longitudinally -rip` Aor cut thruixthe wall ofthe casing `as long as thecasing Offers enough resistance to .the yupwardly moving cuttingrmeans. I have found that when the part of the #casing which has been"frozen fer-'.1

or stuck in the well. has been rippedq said portion will collapse, or in other words, bc reduced in diameter due to collapsing, and eliminate the friction, and therefore, upon further lifting of the tool, the cutting means will lift the string of casing bodily, rather than continue to rip. This is particularly true when the cutting means encounters the heavy, thick joint collar construction after .cutting thru or ripping the frozen part of the casiiig, altho the cutting means will, when the casing is tightly frozen or stuck, readily cut thru said joint collars.

One form of cutting means T have found to -be effective is shown in the accompanying drawing and comprises a heavy tool steel knife bar 10, tempered to have necessary hardness and strength. One end of the knife is pivoted as at 11 ina recess or slot formed in one of the arms 8 of the body, the pvot extending horizontally as does the lower wall 13 of the slot or recess 12. The knife extends transversely across the slot or opening 6V and its free end is movable up and down in a'vertical slot 14 formed in the other arm 8 of the body. The sides of the knife snugly engage the sides of the slots 12 and 14. The lower wall of the slot 14 is in the same horizontal plane with the wall 13 whereby, when the knife is in operative position it will extend at right angles to the body 4. The free end of the knife is pointed, in any suitable manner as at 16, so as to cut thru or rip the casing and collars and the knife is mounted so that the cutting point or end will proj-ect outwardly from the side of the body 4 while the tool is raised and lie within the upper end of the slot 14 while the tool is being lowered. A retractile spring 17 is attached tothe tool body and knife so as to normally hold the knife in down position. This spring will yield when the tool is lowered andv pull downward on the knife at the beginning of the up movement of the tool.

When the casing of a well. becomes frozen or stuck and it is necessary to lift thev casing out of the well, they tool is attached to the rigging, not shown, and lowered into the casing until it reaches the point at which the freezing or stickin of the casing has taken place, or may be lowered to the bottom of the casing. `While the tool is being lowered the point 16 of the knife is engaged by the casing and the knife swings upward on its pivotv against the action ofthe spring 17, so as to lie-well within thev slot 141 and in this way does not interfere with the lowering of the tool. When the tool is lowered suiiicient-ly far', the riggin-g is: operated to raise the tool. linmediately uponv lifting` the tool l the: knife will, by reasonr ofv its weighti and thru actionA ofthe spring-31?, swing downwardly at its free end so as to bring the point in the position shown in Fig. 2. This causes the point to perforate the casing and upon a continuedup pull, the knife will slit or rip the casing vertically as shown at X in Fig. 2. The up pull on the knife tends to lift the casing but the lfrozen or stuck portion of the casing offers sufficient resistance to cause the knife to cut rather than lift. However, when the frozen part`of the casing has been ripped it will collapse, reduce in diameter, and become released from the bore. At this time as the casing offers so little resistance, comparatively, to the up pull of the knife, said knife will lift the casing rather than cut or rip further. This arrangement is provided for by the formation of the cutting or ripping part of the knife, which part should be pointed or otherwise formed so as to rip, as described, but should be blunt enough to avoid cutting after release of the`r frozen or' stuck portion of the casing.

In Fig. 2 the lower part of the casing is shown as frozen or stuck, whereas the upper part is free.

Thus it will be seen that I have provided a simple, inexpensive and reliable tool by the use of which a great deal of time, labor and expense may be saved in pulling out well casngs.

In Fig. 4 I have shown a modified form of the tool. Tn this form, the body 18 of the tool has two knives 19 and 20, mounted as are the knives of the preferred forinof the invention, but so as to extend from opposite sides of the body. This form will longitudinally cut or rip the casing onE opposite sides and otherwise will operate the same as the preferred form of the invention.v

1. A tool for ripping well casing which has become stuck or frozen in a well comprising a tool body adapted to be lowered and raised in a well casing and means on the body including a pivoted member at all times in engagement with the casing and which immediately when the tool is raised from any point in the casing will, solely through frictional engagement with the casing, be moved into and maintained in a position to cause the member to penetrate and rip'the casing as the raising of the tool body is continued.

2. A1 tool for ripping well casing which has become stuck or frozen in a` well comprising a tool body adapted to be Lraised and lowered in a well casingA and a knife pivotedY on theY body and arranged and con structed suchthat it is forced into and maintainedY in inoperative position solely by its engagement with the easing while the tool is being lowered and which, solely d-ue to its frictional engagement with the casing,

immediately when the toolY is raised from:

any point within the casing, will move on its pivot so as to penetrate and rip the casing upon continuation of the lifting of the body.

3. A tool for ripping well casing which has become stuck or frozen in a well comprising a tool body having an opening therein and adapted to be lowered and raised in a well casing, a knife pivoted adjacent to one end to the body within the opening and having its other end adapted'to project outwardly from the opening7 said knife being arranged and constructed so that when the` body is lowered it, will extend in an upwardly inclined position from` its pivoted` end and be held inl inoperative position solely through its contact with the casing and whereby immediately when the body is wardly through the opening so as to pene-l trate the casing and rip through the same as rthe raising of the tool body is continued.

PHILLIP H. COOK.v 

